Dragon's Teeth II - the good stuff
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First off, sneak around till you find the captured adventurers, you *will* need their help! You can either stand back and watch the fight or pitch in for the experince. Watch your spells though - you don't want to injure or incapacitate your allies.
Yuan-ti mages/priests. These should be your first targets. Confusion should be about the only level 4 spell available to you now. Use it, have them attacking each other. Use your thief/ranger to find their spellcasters and target them with confusion and ranged attack spells. Miscast magic, fireball, melf's (causes damage for a few rounds - stopping casting) should be used.
Warriors & archers - these are tough but they love to pack themselves in ranks. Burn them out with fireballs. If you're quick you can fire these through doors and retreat then return for another blast. Rest often - it doesn't make any difference to the game. Archers should be finished off first.
Be patient. Take the time to search for traps. Invisibility is useful because it allows your thief to search for traps at the same time. Take them on room at a time. Scout out all the angles, pick off every individual that you can, get the most from your fireballs. You should be able to summon undead/monsters by now - use them as fodder whilst you plug away with ranged weapons. Haste is a useful "last" spell. I only ever have 1 memorised b/c it tires your party out. Use all your spells then finish off with a haste before you rest.
Xunomei - This is not a difficult fight. Scout her out and reveal yourself. Let her cast her spells and attack you. You need a tank or some summoned fodder. Haste & strengthen your fighters, apply defensive harmony. Whack away with magical weapons. X will chase 1 or 2 characters (usually the weak ones) so give her the run-around whilst you slice her up. Afterwards, go in and pick off the archers/spellcasters in the usual fashion. Then prepare for the long walk home
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